Why did webpack suddenly stop working?

Question

npm

For some reason I stopped compiling, yesterday everything was fine. Today suddenly began to swear at all css files. Writes this:

Child mini-css-extract-plugin node_modules/css-loader/dist/cjs.js??ref--8-2!node_modules/postcss-loader/src/index.js??ref--8-3!node_modules/less-loader/dist/cjs.js??ref--8-4!src/blocks/toggle/toggle.less:
    Entrypoint mini-css-extract-plugin = *
    [0] ./node_modules/css-loader/dist/cjs.js??ref--8-2!./node_modules/postcss-loader/src??ref--8-3!./node_modules/less-loader/dist/cjs.js??ref--8-4!./src/blocks/toggle/toggle.less 3.12 KiB {0} [built] [failed] [1 error]
    
    ERROR in ./src/blocks/toggle/toggle.less (./node_modules/css-loader/dist/cjs.js??ref--8-2!./node_modules/postcss-loader/src??ref--8-3!./node_modules/less-loader/dist/cjs.js??ref--8-4!./src/blocks/toggle/toggle.less)
    Module build failed (from ./node_modules/postcss-loader/src/index.js):
    Error: Cannot find module './Tokenizer'
        at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
        at Function.Module._load (internal/modules/cjs/loader.js:562:25)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
        at Object.<anonymous> (/Users/nikita/Desktop/работа/FSD/node_modules/css-tree/lib/tokenizer/index.js:1:80)
        at Module._compile (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
        at Object.<anonymous> (/Users/nikita/Desktop/работа/FSD/node_modules/css-tree/lib/lexer/generic.js:1:79)
        at Module._compile (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
        at Object.<anonymous> (/Users/nikita/Desktop/работа/FSD/node_modules/css-tree/lib/lexer/Lexer.js:4:15)
        at Module._compile (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
        at Object.<anonymous> (/Users/nikita/Desktop/работа/FSD/node_modules/css-tree/lib/syntax/create.js:4:13)
        at Module._compile (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
        at Module.load (internal/modules/cjs/loader.js:653:32)
        at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
        at Function.Module._load (internal/modules/cjs/loader.js:585:3)
        at Module.require (internal/modules/cjs/loader.js:692:17)
        at require (/Users/nikita/Desktop/работа/FSD/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)

Something happened with post-css. I tried to do npm update - it did not help, but npm install did not download anything. What to do?
Here is the webpack config code:

const path = require('path')
const fs = require('fs')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
//const { VueLoaderPlugin } = require('vue-loader')

// Main const
// see more: https://github.com/vedees/webpack-template/blob/master/README.md#main-const
const PATHS = {
  src: path.join(__dirname, '../src'),
  dist: path.join(__dirname, '../dist'),
  assets: 'assets/'
}

// Pages const for HtmlWebpackPlugin
// see more: https://github.com/vedees/webpack-template/blob/master/README.md#html-dir-folder
// const PAGES_DIR = PATHS.src
const PAGES_DIR = `${PATHS.src}/pages`
const PAGES = fs.readdirSync(PAGES_DIR).filter(fileName => fileName.endsWith('.pug'))
const PAGES_ENTRY = fs.readdirSync(PAGES_DIR).filter(fileName => fileName.endsWith('.js'))

module.exports = {
  externals: {
    paths: PATHS
  },
  entry: {
    kit: `${PATHS.src}/pages/ui-kit.js`
  },
  output: {
    filename: `${PATHS.assets}js/[name].js`,
    path: PATHS.dist,
    publicPath: '/'
  },
  module: {
    rules: [{
      test: /\.pug$/,
      oneOf: [
        {
          use: ['pug-loader']
        }
      ]
    }, {
      test: /\.js$/,
      loader: 'babel-loader',
      exclude: '/node_modules/'
    }, {
      test: /\.(woff(2)?|ttf|eot|svg)(\?v=\d+\.\d+\.\d+)?$/,
      loader: 'file-loader',
      options: {
        outputPath: `${PATHS.assets}fonts`, 
        name: '[name].[ext]'
      }
    }, {
      test: /\.(png|jpg|gif|svg)$/,
      loader: 'file-loader',
      options: {
        outputPath: `${PATHS.assets}img`,
        name: '[name].[ext]'
      }
    }, {
      test: /\.less$/,
      use: [
        'style-loader',
        MiniCssExtractPlugin.loader,
        {
          loader: 'css-loader',
          options: { 
            sourceMap: true,
            url: false
          }
        }, {
          loader: 'postcss-loader',
          options: { sourceMap: true, config: { path: `./postcss.config.js` } }
        }, {
          loader: 'less-loader',
          options: { sourceMap: true }
        }
      ]
    }, {
      test: /\.css$/,
      use: [
        'style-loader',
        MiniCssExtractPlugin.loader,
        {
          loader: 'css-loader',
          options: { 
            sourceMap: true,
            url: false
          }
        }, {
          loader: 'postcss-loader',
          options: { sourceMap: true, config: { path: `./postcss.config.js` } }
        }
      ]
    }]
  },
  resolve: {
    alias: {
      '~': PATHS.src+"/pages",
    }
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: `${PATHS.assets}css/[name].css`,
    }),
    new CopyWebpackPlugin([
      { from: `${PATHS.src}/${PATHS.assets}img`, to: `${PATHS.assets}img` },
      { from: `${PATHS.src}/${PATHS.assets}fonts`, to: `${PATHS.assets}fonts` },
      { from: `${PATHS.src}/static`, to: 'static' },
    ]),

    // Automatic creation any html pages (Don't forget to RERUN dev server)
    // see more: https://github.com/vedees/webpack-template/blob/master/README.md#create-another-html-files
    // best way to create pages: https://github.com/vedees/webpack-template/blob/master/README.md#third-method-best
    ...PAGES.map(page => new HtmlWebpackPlugin({
      template: `${PAGES_DIR}/${page}`,
      filename: `./${page.replace(/\.pug/,'.html')}`
    }))
  ],
}

Maybe I broke something yesterday? It seems that everything is normal. There is an old version on github, now I'll try it out. If it helps, I'll post it. But in any case, I would like to know what the problem is.
UPD: returning to the old version helped, another reminder that you need to use git.